改造java.net.ProtocolException：预期':status'标头不存在

在工作应用程序中突然发生网络调用失败并出现协议异常 . 该应用程序一直工作到昨天，今天所有的网络呼叫都失败了 . 这些调用可以正常使用HTTP和一些HTTPS，但我的 生产环境 endpoint 除外 .

似乎应用程序不仅仅在我使用的 https endpoint 上工作，而是与其他https endpoints 一起工作，我试过了 .

我用这种方式解决了问题 -

OkHttpClient client = new OkHttpClient();
client.setProtocols(Arrays.asList(Protocol.HTTP_1_1));

和

并且我的问题解决了，除了这个，将我使用过的库okhttp2升级到okhttp3后也正常工作 https endpoint .

• 我不明白可能是什么原因？

• 如果是okhttp2的问题，为什么它最近工作？

• 为什么它在某个特定的 endpoint 上出现问题并且在某些终端上工作正常？

我跟着this和this链接，但我仍然不明白什么是真正的问题 .

Note 1: - This is working fine in Samsung S4 (Android verison 4.4.2) device. and in logs showing "OkHttp-Selected-Protocol: http/1.1" but it's not working in Android 5.1.1, 6.0.1, 7.1 & Android 8.1.0

Note 2: - It was working perfectly without setting any explicitly HTTP1.1 protocol but it suddenly stopped working (in device 5.1.1, 6.0.1, 7.1 & Android 8.1.0).

这是日志，

java.net.ProtocolException: Expected ':status' header not present at
com.squareup.okhttp.internal.http.SpdyTransport.readNameValueBlock(SpdyTransport.java:197)at com.squareup.okhttp.internal.http.SpdyTransport.readResponseHeaders(SpdyTransport.java:104)
at com.squareup.okhttp.internal.http.HttpEngine.readNetworkResponse(HttpEngine.java:917)
at com.squareup.okhttp.internal.http.HttpEngine.access$300(HttpEngine.java:95)
at com.squareup.okhttp.internal.http.HttpEngine$NetworkInterceptorChain.proceed(HttpEngine.java:902)
at com.squareup.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:760)
at com.squareup.okhttp.Call.getResponse(Call.java:274)
at com.squareup.okhttp.Call$ApplicationInterceptorChain.proceed(Call.java:230)
at com.squareup.okhttp.Call.getResponseWithInterceptorChain(Call.java:201)                                                                                         
at com.squareup.okhttp.Call.execute(Call.java:81)
at retrofit.client.OkClient.execute(OkClient.java:53)                                                                                         
at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:326)                                                                                            
at retrofit.RestAdapter$RestHandler.access$100(RestAdapter.java:220)                                                                                             
at retrofit.RestAdapter$RestHandler$2.obtainResponse(RestAdapter.java:278)                                                                                            
at retrofit.CallbackRunnable.run(CallbackRunnable.java:42)                                                                                       
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)                                                                                     
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)                                                                                      
at retrofit.Platform$Android$2$1.run(Platform.java:142)
at java.lang.Thread.run(Thread.java:818)